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A comment on Lessons I Wish I Had Learned Before Teaching Differential Equations (1997) [pdf]. Parent comment

Re:Lessons I Wish I Had Learned Before Teaching Differential... by GregBuchholz on Monday September 04, 2017 @02:49AM (#15166234)
>I suggest teaching vectors before trig. You can get the cosine and sine from the dot and cross products.

What about geometric algebra instead?

http://www.shapeoperator.com/2016/12/12/sunset-geometry/

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